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DEMO MANUAL
DC2155A-A/DC2155A-B
QUICK START PROCEDURE
Measuring Efficiency
To accurately measure efficiency of any configuration, do
the following:
Set JP6 to OFF position to disable the pulse generator
n
circuits.
DC2155A-A version. Measure V
n
ceramic capacitor (C7 for CH0, C21 for CH1). Measure
V
across the output ceramic capacitor (C10 for
OUT
CH0, C26 for CH1).
100
98
96
94
92
90
88
86
84
82
80
0
1
2
3
4
LOAD CURRENT (A)
I
= 0A to 12A
LOAD
f
= 150kHz
SW
EXTV
= 12V (TIED TO V
CC
ONE OUTPUT RAIL IS
ENABLED AT A TIME.
(a) DC2155A-A: Efficiency at 12V
6
across the input
IN
+
V
OUT
Figure 5. Measuring Output Voltage Ripple
18V
IN
24V
IN
32V
IN
48V
IN
5
6
7
8
9
10
11 12
)
OUT
DC2155 F06a
OUT
DC2155A-B version. Measure V
n
ceramic capacitor C7. Measure V
ceramic capacitor C10.
Measuring Output Ripple Voltage
An accurate ripple measurement may be performed by
using the below configuration across C10/C26.
–
C
OUT
GND
100
98
96
94
92
90
88
86
84
82
80
0
1
I
LOAD
f
= 150kHz
SW
EXTV
CC
ONE OUTPUT RAIL IS
ENABLED AT A TIME.
(b) DC2155A-A: Efficiency at 5V
Figure 6.
across the input
IN
across the output
OUT
18V
IN
24V
IN
32V
IN
48V
IN
2
3
4
5
6
7
8
9
10
11 12
LOAD CURRENT (A)
= 0A to 12A
= 5V (TIED TO V
)
OUT
DC2155 F06b
OUT
Rev. C
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